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Apparatus and method for down converting multichannel programs to dual channel programs using a smart coefficient generator

a technology of smart coefficients and apparatus, applied in the field of apparatus and methods for storing multichannel audio programs, can solve problems such as artist and/or producer losing control over the modified program, and not specifying how

Active Publication Date: 2002-08-08
WARNER MUSIC GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] In view of the above-mentioned disadvantages, it is an objective of the present invention to provide a method and apparatus that can be used to generate a set of down converting coefficient which allow for the conversion of a multichannel program into a dual channel (left / right) program.

Problems solved by technology

A problem with this type of recording is that in some instances, for example, in a car, or in other environments, such a high quality is not required and a lower quality dual channel stereo reproduction (left and right) is sufficient.
However, this type of conversion is very inaccurate and results in sounds which may not be acceptable to consumers.
If the down conversion takes place using standardized or arbitrary coefficients, the artist and / or producer loses control over the modified program.
However, the standards do not specify how the coefficients are to be determined.

Method used

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  • Apparatus and method for down converting multichannel programs to dual channel programs using a smart coefficient generator
  • Apparatus and method for down converting multichannel programs to dual channel programs using a smart coefficient generator
  • Apparatus and method for down converting multichannel programs to dual channel programs using a smart coefficient generator

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Embodiment Construction

[0027] FIG. 1 shows a system 100 for producing a medium with a multichannel program in accordance with this invention. In this system 100, a program consisting of a musical work has been previously recorded and processed, if necessary, and then stored in program storage 10. The storage 10 may be a hard drive, a digital or analog recording media, etc. If the program is stored as analog signals, a suitable conversion is performed on the signals by an analog-to-digital converter (not shown). In order to record this multichannel program on a DVD, the program is first sent to a mixer 12 which combines the six channels using various encoding and error correction schemes into a single data stream. The data stream is combined by mixer 24 with scripting data and then recorded by the recording equipment 14. Scripting data is generated which provides additional information about the musical work, including a table of contents, the name of the composer(s), the orchestra and / or devices used to p...

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Abstract

An apparatus for recording a multichannel program includes an audio converter adapted to convert said multichannel program at least partially into a modified program requiring less channels than said multichannel program. The audio converter including control elements used to modify the conversion process used to generate said modified program. A coefficient generator coupled to said converter to generate a coefficient indicative of the operation of said controls. A mixer is arranged to mix the coefficient with program data. A recorder is arranged to record the mixed data on a medium, whereby the medium can be played either using a multichannel player device or a reduced channel player device by using said coefficient.

Description

BACKGROUND OF THE INVENTION[0001] A. Field of Invention[0002] This invention pertains to a method and apparatus for storing multichannel audio programs such as recordings of DVDs and other similar media. More particularly, the present invention pertains to a method and apparatus for determining coefficients useful for down-converting multichannel recordings to a dual channel (right / left) stereo recording. The coefficients thus obtained are recorded on the respective media together with program and other data as well.[0003] B. Description of the Prior Art[0004] Standard recordings of audio programs, for example for DVD or other modern high quality recording media are normally include up to six or even more channels. The standard six channels are generally termed as left front (LF), right front (RF), left rear (LR), right rear (RR), center (C) and subwoofer (SW). A problem with this type of recording is that in some instances, for example, in a car, or in other environments, such a hi...

Claims

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Application Information

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IPC IPC(8): G11B20/00G11B20/10H04H1/00H04H20/89H04H60/27H04S3/00
CPCG11B20/00992G11B20/10527H04H20/89H04H60/27H04S3/00
Inventor MCPHERSON, ALAN J.LYDECKER, GEORGE H.
Owner WARNER MUSIC GROUP
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